Chromatography Columns Applications

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  • Category: Monitoring & Testing ×

  • Subcategory: Chromatography Columns ×

Rapid Determination of Pesticides in Spinach

by Sigma-Aldrich Co., LLC     based in Bellefonte, PENNSYLVANIA (USA)

Highly pigmented foods, such as spinach, require cleanup prior to analysis for pesticide residues. A dual-layer SPE tube containing graphitized carbon and aminopropyl on silica (NH2) is often used because; Carbon removes pigments and sterols and NH2 removes fatty acids, polar pigments, organic acids, and sugars. Removing these matrix materials reduces interferences that can lead to ion suppression in LC-MS, inlet contamination in GC-MS, and column contamination for both techniques. Our Supel Sphere Carbon/NH2 SPE tube uses spherical materials for both the carbon and NH2 layers, providing fast, more consistent flows compared to tubes containing granular material. This allows gravity elution (instead of vacuum elution) to be applied to Supel Sphere tubes, resulting in more contact time between extracts and sorbents.

Reduced Fat Interference with Analysis of Pesticides in Avocados

by Sigma-Aldrich Co., LLC     based in Bellefonte, PENNSYLVANIA (USA)

QuEChERS (Quick, Easy, Cheap, Effective, Rugged, Safe) is a very popular method for the extraction and cleanup of fruit and vegetable samples for pesticide residue analysis.2-4 The extraction step uses acetonitrile and a salting out effect (with MgSO4). Cleanup is then accomplished using dispersive SPE (dSPE) followed by a centrifuge step prior to analysis. This application shows the clean-up and analysis using Supel™ QuE Z-Sep+ QuEChERS and an SLB®-5ms GC column.

Increased Pigment Removal with Analysis of Pesticides in Oranges

by Sigma-Aldrich Co., LLC     based in Bellefonte, PENNSYLVANIA (USA)

An application was developed to demonstrate increased pigment removal for the analysis of pesticides, using Supel™ QuE Z-Sep/C18 QuEChERS and an Ascentis® Express C18 HPLC Column. The improved cleanup can decrease column and instrument fouling, leading to extended LC column lifetime and reduced instrument downtime.

Measurement of methane, methanol and ethanol for the biomass monitoring for biofuels.

by MOCON - Baseline     based in Lyons, COLORADO (USA)

The Series 8900 provides direct measurement of methane, methanol, and ethanol for the biofuel industry. The Series 8900 GC employs a flame ionization detector (FID). The methane, methanol, and ethanol in the gas sample are physically separated using proprietary GC columns. A dual-column configuration with timed backflush to vent is used to strip off moisture and heavier gases. At sample injection, a fixed volume of sample is carried through the pre-cut column. The backflush is timed so that primarily the MME and other similar compounds continue on to the analytical column. Contaminants are then backflushed to vent. Methane, methanol, and ethanol are separated from potentially interfering components on the analytical column and elute to the detector for analysis.

Measurement of methyl ethyl ketone, chloroform & carbon tetrachloride in air for remediation & super fund sites

by MOCON - Baseline     based in Lyons, COLORADO (USA)

The Series 8900 Analyzer provides direct measurement of Methyl Ethyl Ketone, Chloroform and Carbon Tetrachloride in ambient air. This instrument is utilized for remediation and Super Fund sites and to monitor workplace exposure limits.

Measurement of C1-C5 with carbon dioxide for oil & gas exploration.

by MOCON - Baseline     based in Lyons, COLORADO (USA)

The PetroAlert Model 8900 combines the selectivity of gas chromatography with the sensitivity, broad dynamic range, and hydrocarbon selectivity of a flame ionization detector (FID) providing fast analysis of C1-C5 hydrocarbons and Carbon Dioxide required in Mud Logging for Oil & Gas exploration. The PetroAlert Model 8900 uses a dual column configuration with timed backflush to vent which is used to strip off moisture and C6+ hydrocarbons. A pre-cut column is used in series with the analytical column. At sample injection a fixed sample volume is carried to the pre-cut column. Backflush of the pre-cut column is timed from sample injection so that only C1-C5 hydrocarbons are eluted from the pre-cut column to the analytical column. C6+ hydrocarbons on the pre-cut column are then vented. Then a third column is used in conjunction with a second 10-port valve for individual analysis of methane. C1-C5 hydrocarbons are separated on the analytical column and elute to the flame ionization detector (FID) for analysis.

Mass flow devices for analytical instrumentation

by Axetris Ag     based in Kaegiswil, SWITZERLAND

Axetris mass flow devices are used in a variety of analytical applications: Gas Chromatography, Mass Spectrometry, Atomic Spectroscopy, Elemental Analysis, Thermal Analysis, Bioreactor and Fermentor.

Chromatography systems for environmental monitoring

by Dikma Technologies Inc.     based in Lake Forest, CALIFORNIA (USA)

With the growth of contamination generated from agricultural and industrial production, it causes a threat to the enviroment including drinking water, atmosphere and soil. The chemists have always seeked out the effective analytical methods to detect and identify chemical contaminants. Dikma provides innovative products and application solutions according to government regulations and industry standards, for air and water quality monitoring, gas detection.

Total sulfur measurement for sulfur compounds in CO2 for food & beverage industry

by MOCON - Baseline     based in Lyons, COLORADO (USA)

The BevAlert Model 8900 provides a total sulfur measurement for sulfur compounds in Carbon Dioxide. The measurement includes organic sulfides, Sulfur Dioxide, Carbonyl Sulfide, and Hydrogen Sulfide. The instrument is utilized by Specialty Gas Manufacturers and the Food and Beverage Industry to monitor sulfur compounds in CO2 used in carbonated beverages.

Measurement of acetaldehyde, methanol, & benzene in CO2 applications for gas manufacturers & food & beverage industry

by MOCON - Baseline     based in Lyons, COLORADO (USA)

The BevAlert Model 8900 provides direct measurement of Acetaldehyde, Methanol, and Benzene (AMB) in Carbon Dioxide. The instrument is utilized by Specialty Gas Manufacturers and the Food and Beverage Industry to monitor trace impurities in CO2 used in carbonated beverages. The BevAlert Model 8900 employs a photoionization detector (PID). The AMB in the gas sample are physically separated using proprietary GC columns. A dual-column configuration with timed backflush to vent is used to strip off moisture and heavier gases. At sample injection, a fixed volume of sample is carried through the pre-cut column. The backflush is timed so that primarily the AMB and other similar compounds continue on to the analytical column. Contaminants are then backflushed to vent. Acetaldehyde, Methanol, and Benzene are separated from potentially interfering components on the analytical column and elute to the detector for analysis.

Measuring aromatic hydrocarbons (BTEX) for pollution control and environmental monitoring

by MOCON - Baseline     based in Lyons, COLORADO (USA)

The Series 8900 BTEX Analyzer provides direct measurement of Benzene, Toluene, Ethylbenzene, and Xylenes in ambient air. This instrument is utilized in ambient air networks around metropolitan areas and fence-line monitoring at industrial sites. The Series 8900 BTEX Analyzer employs a photoionization detector (PID) as the sensing element. This detector is specific to volatile organic compounds. The Benzene, Toluene, Ethylbenzene, and Xylene`s in the gas sample are physically separated using proprietary GC columns.

Analysis of VOC compounds in water by Purge & Trap or dynamic headspace

by Chromatotec Group     based in Val de Virvée, FRANCE

Context & Challenges Volatile organic compounds (VOC) can be dissolved in water. Sometimes water is polluted and to study contamination of VOC in finished drinking water, VOC must be measured. Chromatotec® Solutions Chromatotec® has developed a specific system for the measurement of VOC in water: a Purge & Trap system, the airmoPURGE. The analyzer is coupled with a degasing system allowing the extraction of dissolved gases. The complete system is based on: - 502.2 method from US EPA – “Volatile organic compounds in water by purge and trap capillary column gas chromatography with photoionization and electrolytic conductivity detectors in series – Revision 2.1”. - 524.2 method from US EPA – “Measurement of purgeable organic compounds in water by capillary column gas chromatography/mass spectrometry – Revision 4.0”.

Liquid Chromatography for soil consultancy

by Custom Stack Analysis, LLC.     based in Alliance, OHIO (USA)

Everyone has a responsibility to care for the environment to reduce the levels of pollution, including businesses that daily release emissions into the air and the ground. This is why we provide a full-service environmental testing service to help businesses identify problems and resolve them so they operate in the most environmentally-friendly method possible. We offer air emission testing, emissions monitoring services and stack emissions testing to businesses of all sizes.

Determination of Additives in Beverages using Ascentis Express Columns

by Sigma-Aldrich Co., LLC     based in Bellefonte, PENNSYLVANIA (USA)

Beverages, such as sodas and energy drinks, can include a number of polar ingredients, which are easily soluble in the water matrix of the drinks. These ingredients include sweeteners (sugars and sugar substitutes), caffeine, vitamin supplements, amino acids, organic acids, and plant extracts. Because the analytes are already in solution, there is no need for extensive sample preparation. Dilution followed by direct injection into an HPLC is typically suitable. In this article we present two beverage applications using Ascentis Express HPLC columns. Ascentis Express columns offer faster HPLC on any system. One benefit is their ability to produce the resolution, efficiency, and speed on conventional HPLC systems that is associated with the use of sub-2 micron columns on a UHPLC system, without generating high backpressure. Column chemistries (RP-Amide and HILIC) were selected for this article based on their enhanced performance with polar compounds in comparison to C18.

Reproducible Recoveries of Pesticides from Fruits and Vegetables

by Sigma-Aldrich Co., LLC     based in Bellefonte, PENNSYLVANIA (USA)

A group of 30 compounds was selected, representing pesticides, acaricides, insecticides, and fungicides. These samples were analyzed using Supel™ QuE QuEChERS and an Ascentis® Express RP-Amide HPLC Column.

Ozone generators for aquaculture applications

by Absolute Systems Inc.     based in Edmonton, ALBERTA (CANADA)

Ozone provides both economical and ecological advantages to the Aquaculture industry. Ozone oxidation of aqua-farms improve water quality, destroys organics,  and increases DO levels which result  in faster growth rates, decreased death tolls, and provides an overall healthier and safe environment for fish.

Improved Reproducibility and Reduced Sample Preparation Time for the HPLC Analysis of Aflatoxins in Raw Peanut Paste

by Sigma-Aldrich Co., LLC     based in Bellefonte, PENNSYLVANIA (USA)

The US FDA and international regulatory agencies have set contamination levels for aflatoxins in animal feedstuffs. Since Aspergillus may infect commodities pre-harvest, during storage or during processing, monitoring for aflatoxins in associated agricultural commodities at all stages of production is requisite. Field screening methods exist that are adequate to estimate contamination levels for aflatoxins. When additional confirmation or quantification is desired, chromatographic laboratory analysis is often necessary. Preparation of matrix samples prior to chromatographic analysis typically requires extraction and purification. Commonly, immunoaffinity columns (IAC), which employ a multi-step bind and elute mechanism to concentrate and purify aflatoxins, are used to purify matrix samples for subsequent analysis. Solid phase extraction (SPE), an alternate method which may use interference removal, can also be employed.

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